These are a decent set of headers, they fit pretty decent too. I just taken them off this weekend. I don't know what brand they are but, they are a coated with the old type alumnium coating? They are 1 7/8 with a 3" collector $325 shipped Thanks for looking, John.
They look like the set of original Kenne-Bell headers I had 25 years ago. They look like they are in good shape and would probably take a JetHot coating well, making them look like new!
The question should be will they work in a Riv if that is the car you are going to put the engine in. I think Riv owners have to use shortys but you may want to check.